Cross-Layer Optimization for UWB-Based AD HOC Networks

In this paper, we consider a UWB-based ad hoc network and study how to maximize data rate utility for a group of communication sessions. We formulate the data rate utility problem into a nonlinear programming (NLP) problem through a cross-layer approach by taking into consideration of scheduling and power control at link layer and routing at network layer. The main contribution of this paper is the development of a solution procedure based on branch-and-bound framework. We employ a powerful optimization technique called reformulation linearization technique (RLT) to obtain a linear relaxation, which is a key component required in the branch-and-bound framework. Numerical results demonstrate the importance of cross-layer approach and offer some important insights